Just in case you are interested, if you freeze them slowly you can form larger ice crystals that will rupture the cell. If you freeze them quickly to -80C or so the ice crystals stay small and more bacteria survive. Although freezing will kill some its not a good method of sterilizing because of spores. Spores have dehydrate cores. Source: ME

biggest part is brushing i think. some warm water, rubbing alcohol (ideally - i tried listerine and it worked fine) and scrub the inside. went from evolv's stinking up the entire apartment to a pleasant minty odor on my feet after every climb.

also shove some newspaper each shoe after you clean them. let it sit, take out the soggy newspaper and put in some fresh paper for the night.

Getting a well established funk out of older shoes is tough, to say the least. What I prefer is to give my shoes regular deodorizer spray-downs and periodic washing (every 1.5 months or so), rather than waiting for the odor to become unbearable.

To wash, here's what I do: 1.Remove laces (makes working under the tongue easier and drying faster) 2.Immerse shoes in lukewarm water. 3.With soft toothbrush or bare hands, scrub with anitbacterial dish soap (gentle enough on leather/synthetics, no moisturizers like hand soaps, lovely scent, etc) 4.Rinse 5. Hang or otherwise position shoes in front of a fan to dry, with the toes pointing up (allows for better drainage)

For really nasty shoes, I'll let the shoes soak in soapy water for a few hours following the initial scrub and rinse. Putting the shoes in a mesh bag and throwing them in the washer on gentle (cold water!) is way faster, but loud. My apartment uses a shared laundry facility, and the noise is not well-liked by the neighbors, so I wash my shoes by hand.

I haven't tried this yet.... But, someone told me to put some kitty litter into a Knee-Hi stocking, tie a knot in it and place that in your shoe. The kitty litter absorbs moisture. I'd guess a scented or charcoal infused kitty litter would be even better.

Knee-Hi stockings are rip-your-head-off strong and cheap ($0.59/pr at Walgreen's for knockoffs). I use them for "hop bags" when brewing and dry hopping beer. I bet they could make a decent chalk sack for inside your chalk bag, too.